package org.shj.netty.chartper12;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.util.CharsetUtil;

import java.net.InetSocketAddress;

public class ChineseProverbClient {

	public void run(int port) throws Exception{
		EventLoopGroup group = new NioEventLoopGroup();
		try{
			Bootstrap b = new Bootstrap();
			b.group(group).channel(NioDatagramChannel.class)
			 .option(ChannelOption.SO_BROADCAST, true)
			 .handler(new ChineseProverbClientHandler());
			
			Channel ch = b.bind(0).sync().channel();
			
			//向网段内的所有机器广播UDP消息
			ch.writeAndFlush(new DatagramPacket(Unpooled.copiedBuffer("谚语字典查询?", CharsetUtil.UTF_8), 
					new InetSocketAddress("255.255.255.255", port))).sync();
			
			if(!ch.closeFuture().await(15000)){
				System.out.println("查询超时");
			}
		}finally{
			group.shutdownGracefully();
		}
	}
	
	public static void main(String[] args) throws Exception{
		int port = 8080;
		
		if(args != null && args.length > 0){
			try{
				port = Integer.valueOf(args[0]);
			}catch(NumberFormatException e){
				
			}
		}
		
		new ChineseProverbClient().run(port);
	}
}
